Problem $3\mathrm{.}1$

An existing process is not meeting the Rockwell$-$C specifications. Determine the process capability

based on the range values for $25$ subgroups of size $4.$ Data are shown below:

A new process is started, and the sum of the sample standard deviations for $25$ subgroups

of size $4$ is $105.$ Determine the process capability.

ANSWER USING EXCEL